Steel water arch and siphon



1927' G. D. MLEOD ET AL STEEL WATER ARCH AND SIPHON Filed Oct. 9, 1925 2Sheets-Sheet 1 n u n J INVENTORS ATTORNE G. D. M LEOD ET AL STEEL WATERARCH AND SIPHON Filed Oct. 9, 1925 2 Sheets-$heet .2

i u l/ r:

WOQQQQ no aeee mvp 9909: Q? oeeooooo lNVENTORS I ATTORNEY Patented Oct.18, 1927.

uni'rsn states I I V 1,646,3ti

EOR Manson/or CHICAGO, rrrnononn PQKORSKI, or ennui/ Er oITY,

ILLIIVOIS, A3733 THOMAS J. HEWITT, OF HAIVIMOND; IlI'NDIANA.

STEEL WATEE ARClf-I AND SEPI-IO NQ Application filedOctober 9, 1825.

.Thisinvention relates to locomotives and more particularly to what weterm a steel water arch and siphon.

One of the main objects of the invention water throughout'the boiler soas to obtain uniform heating thereof thus eliminating se- 5 Verestresses and strains due to different temperatures at diiferent parts ofthe boiler. Another object is to provide an arch which will also act asa siphon in such manner as to cause water to flow continuously over the0 crown sheet of the fire box, the siphoning effect causing a continuousflow ofwater from the lower to the upper portion of the arch so as tobring thewater to the source of heat and insure quick generation of 5comparatively great quantity of steam for a given amount of fuelconsumed. A fur ther objectis .to provide an arch of this characterwhich, when-applied, will act to materially reinforce the firebox'construction; Further objects will appear from the detaileddescription.

In the drawings: Fig. 1 is a central vertical section taken through thearch as applied andassociated 3 parts of the locomotive boiler.

Fig. 2 is a section taken substantially on line 2-2 of Fig. .1. I

Fig. 3 is a section taken substantially on line 33 of Fig. 1. i Fig. iis a fragmentary plan View look ng down on the crown sheet takensubstantially on line 44 of Fig, 1.

Fig. 5 is a perspective view of the arch and siphon.

i The arch includes a. body 1 formed of sheet metal of suitable gaugeand temper from the lower forward end of which pro jects an extension 2.The body 1 is provided at the upper end of each side thereof with anextensionforming a siphon element 3, and the end wall 4 of thebody'connecting these elements is curled downwardly and inwardly asshown. The structure thus produced is provided with a continuous periphi eral flange 5 at each side by means of which Serial r o. 615% thestructure is secured by welding to the side plates of fire box I) ofxthelocomotive boiler B. The sides of body 1 and exten.

sion 2, as well as the siphon elemcntsB, have dlrect communication withthe water space a surrounding the fire box' so that the water taken fromthis space can flow directly into the arch and siphon from both sidesthereof. As more clearly. illustrated in Figure 4:. the siphon elements3 extend inwardly and open through the crown sheet 0 ,ofthe fire boxforming, in eifechtubular extensionsiof body 1 which are so disposedthat water discharged through, elements 3 will flow onto and overthe'crown sheet 6. This feature of the construction is of importance as@[JIQQ venting injury to the crown sheet such will occur if waterwere=not continuously supplied thereto. f

The products of combustion from the tire box. 5 flow over and about thearch, a por- I tion oft-hese products flowing through the space 6between. the siphon elements 3 and nto the combustion chamber d, theremain mg portion ofthe. products of combustion: i

flowing over the entire face of body and about extension 2 thcreof, theproductsof combustion then flowing from combustion chamber or space :(Zthrough flue-tubes e which are securedthrough flue plate 7. Th

waterin the arch and siphon member is exposed directly -to the intenseheat of the lire box, where: the greatest amount of heats generated ina. locomotive boil-enas is kuown, 1 V

and is quickly heated to a very high temper 5' ature so as .to producesteam in great quantities. The water which is thusv :heated rushesupwardly from extension Qjthrough body 1 and is caused to flow aboutthearohcd or curved top wall 4 in opposite directions into the siphonelements 3 from which the water is projected and is sprayed onto andoverthe crown sheet .10. The water which flows upwardly throughthe body 1 isre.- placed by water which flows into extension 2 from the rearwardlower portion of barrel 7 of'the boiler. This causes a continuouscirculation of water from the lower portion of the barrel of the boilerupwardly through the arch and siphon structure, the 'water from thisstructure flowing forwardly in the barrel of the boiler so that acontinuous circulation is maintained throughout the whole length of theboil-er structure. This insures uniform heating of the water within theuneven heating of the water, that is, due to the water at the lowerportion of the boiler being of a much lower temperature than the waterat the upper portion thereof. In this connection it is to be noted thatextension 2 communicates withthe water space adjacent the lower portionof the barrel {7 of the boiler, this extension being positionedapproximately at what is known as the mud pot portion of the boiler.This insures thoroughand rapid circulation of thewater and very evenheating thereof, resultlng in generation of a comparatively greatquantity of steam for a given amount of fuel con sumed. In thisconnection, it will be noted thatthe water flowing through the arch andsiphon structureis forced to flow in a CO]]1 paratively thin, flat sheetwhich is exposed at its upperand under sides, as well as its top andlower edges, to the direct-action of the products of combustion from thefire box 2') so as to be quickly heated to ,a high tenr perature andconverted into steam. This rapid heating and-consequent rapidcirculation of the water through. the arch and siphon structure causesthe water to bathe charged through elements 3 at suchvelocity that thewater will be sprayed around and will flow over the crown sheet 0 .inthe event that the level of the water in the boiler falls amoreciablybelow the crown sheet, thus preventing serious injury to thecrown sheetor possible serious accidents due to the water level in the boiler b6111below the normal safetylevel. As thewater is distributed uniformlythroughout the arch and siphon structure, all possibility of theformation of a dry spotyor of the forming'of a steam pocket, withconsequent injury to the arch or danger of exposure is eliminated.

As the combined arch and siphon is secured to-the side portions of thefire box structure it serves to materially reinforce the fire box,particularly in view of the fact that this device is of hollowconstruction. To impart additional strength and rigidity to the arch andsiphon structure, body 1 arched slightly upwardly and inwardly, asillustrated in Figure 1, and this structure,

well as the fire box construction is provided with suitable spaced staybolts secured thereon in a known manner.

As will beunderstood, and as above indicated, changes in theconstruction and arrangement of partscan beresorted to without departingfrom the field and scope of the same, and we intend to include all suchvariations as fall within the scope of the appended claims, in thisapplication in which the preferred form only of our invention isdisclosed.

What we claim is:

1. In combination with the fire box of a boiler, a combined arch andsiphon structure including a comparatively thin hollow body extendingacross the fire box and secured to the side walls thereof, the bodybeing inclined downwardly toward one end ofthe fire box and beingprovided at its lower end with an extension disposed approximatelyhorizontally, the body being provided at its upper end with lateralextensions opening through the crown sheet of the fire box. the

body and the extension thereof opening tension thereof being secured toand opening through the side walls of the fire box.

3. In combination with av boiler including a fire box, an arch andsiphon structure in cluding a comparatively thin hollow body inclineddownwardly and forwardly of the fire box and provided at its lower endwith an extension projecting forwardly in the fire box, said body beingfurther provided at its upper endwith lateral extensions cured to andopening through the crown sheet of the fire box and with an arcuate topi wall connecting the lower ends of said ex tensions, the body and theextension at the lower end thereof being secured to and opening throughthe side walls of the firebox,

said body beingarched longitudinally I11 testimony whereof we affix oursignatures.

GEORGE D. MoLEOD.

THEODORE F. POKORSKI." T. J. HEWITT. f

